Micro dose acquisition in Leg length Discrepancy using the EOS imaging system

Janni Jensen, Bo Mussmann, Niels Wisbech Pedersen, Zaid Al-Aubaidi, Trine Torfing

Publikation: Konferencebidrag uden forlag/tidsskriftKonferenceabstrakt til konferenceForskningpeer review

Resumé

Objectives Leg Length Discrepancy (LLD) is often diagnosed in young patients who undergo repeated x-ray examinations quantifying the length discrepancy and monitoring progression. In our department LLD images are currently acquired using a low dose bi-plane system named EOS. Prior to the acquisition of diagnostic images a scout image is acquired at extremely low dose for planning purposes, i.e. approximately 1% of the dose required for diagnostic images. Dose reduction is important because children and adolescents are more sensitive to radiation than adults and they may undergo several LLD examinations. The purpose of the study was to investigate the accuracy and reliability of LLD measurements performed on scout images compared to diagnostic images. Materials and Methods: A retrospective pilot study including 30 consecutive patients (age 6-15 years) was performed. Two senior musculoskeletal radiologists measured the length of the femur, tibia and the total leg length on both legs on scout and diagnostic images. The measurements on scout and diagnostic images were performed in two separate sessions and the radiologists were blinded to the identity of the patients. Results: No significant differences between scouts and diagnostic images were found. The mean femoral length difference for the observers was 0.11 cm (p=0.09) and 0.07 cm (p=0.24) respectively, mean tibial length difference was 0.02 cm (p=0.77) and 0.01 cm (p=0.84). The mean total leg length difference was 0.01 cm (p= 0.92) and 0.03 cm (p=0.73). ICC was >0.99 indicating excellent inter rater reliability. Conclusion: The results suggest that there is no significant difference in LLD measurements performed on scouts and diagnostic images. Thus, scout based LLD measurements can be accurately and reliably performed in EOS.
OriginalsprogEngelsk
Publikationsdato24. okt. 2014
StatusUdgivet - 24. okt. 2014
BegivenhedDansk Ortopædkirurgisk Selskabs Kongres 2014 - Radisson Blu Scandinavia Hotel, København, Danmark
Varighed: 22. okt. 201424. okt. 2014

Konference

KonferenceDansk Ortopædkirurgisk Selskabs Kongres 2014
LokationRadisson Blu Scandinavia Hotel
LandDanmark
ByKøbenhavn
Periode22/10/201424/10/2014

Emneord

  • EOS imaging
  • leg length discrepancy
  • Pediatrics
  • Radiology
  • Orthopedics

Citer dette

Jensen, J., Mussmann, B., Pedersen, N. W., Al-Aubaidi, Z., & Torfing, T. (2014). Micro dose acquisition in Leg length Discrepancy using the EOS imaging system. Abstract fra Dansk Ortopædkirurgisk Selskabs Kongres 2014, København, Danmark.
Jensen, Janni ; Mussmann, Bo ; Pedersen, Niels Wisbech ; Al-Aubaidi, Zaid ; Torfing, Trine. / Micro dose acquisition in Leg length Discrepancy using the EOS imaging system. Abstract fra Dansk Ortopædkirurgisk Selskabs Kongres 2014, København, Danmark.
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title = "Micro dose acquisition in Leg length Discrepancy using the EOS imaging system",
abstract = "Objectives Leg Length Discrepancy (LLD) is often diagnosed in young patients who undergo repeated x-ray examinations quantifying the length discrepancy and monitoring progression. In our department LLD images are currently acquired using a low dose bi-plane system named EOS. Prior to the acquisition of diagnostic images a scout image is acquired at extremely low dose for planning purposes, i.e. approximately 1{\%} of the dose required for diagnostic images. Dose reduction is important because children and adolescents are more sensitive to radiation than adults and they may undergo several LLD examinations. The purpose of the study was to investigate the accuracy and reliability of LLD measurements performed on scout images compared to diagnostic images. Materials and Methods: A retrospective pilot study including 30 consecutive patients (age 6-15 years) was performed. Two senior musculoskeletal radiologists measured the length of the femur, tibia and the total leg length on both legs on scout and diagnostic images. The measurements on scout and diagnostic images were performed in two separate sessions and the radiologists were blinded to the identity of the patients. Results: No significant differences between scouts and diagnostic images were found. The mean femoral length difference for the observers was 0.11 cm (p=0.09) and 0.07 cm (p=0.24) respectively, mean tibial length difference was 0.02 cm (p=0.77) and 0.01 cm (p=0.84). The mean total leg length difference was 0.01 cm (p= 0.92) and 0.03 cm (p=0.73). ICC was >0.99 indicating excellent inter rater reliability. Conclusion: The results suggest that there is no significant difference in LLD measurements performed on scouts and diagnostic images. Thus, scout based LLD measurements can be accurately and reliably performed in EOS.",
keywords = "EOS imaging, leg length discrepancy, Pediatrics, Radiology, Orthopedics",
author = "Janni Jensen and Bo Mussmann and Pedersen, {Niels Wisbech} and Zaid Al-Aubaidi and Trine Torfing",
year = "2014",
month = "10",
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Jensen, J, Mussmann, B, Pedersen, NW, Al-Aubaidi, Z & Torfing, T 2014, 'Micro dose acquisition in Leg length Discrepancy using the EOS imaging system', Dansk Ortopædkirurgisk Selskabs Kongres 2014, København, Danmark, 22/10/2014 - 24/10/2014.

Micro dose acquisition in Leg length Discrepancy using the EOS imaging system. / Jensen, Janni; Mussmann, Bo; Pedersen, Niels Wisbech; Al-Aubaidi, Zaid; Torfing, Trine.

2014. Abstract fra Dansk Ortopædkirurgisk Selskabs Kongres 2014, København, Danmark.

Publikation: Konferencebidrag uden forlag/tidsskriftKonferenceabstrakt til konferenceForskningpeer review

TY - ABST

T1 - Micro dose acquisition in Leg length Discrepancy using the EOS imaging system

AU - Jensen, Janni

AU - Mussmann, Bo

AU - Pedersen, Niels Wisbech

AU - Al-Aubaidi, Zaid

AU - Torfing, Trine

PY - 2014/10/24

Y1 - 2014/10/24

N2 - Objectives Leg Length Discrepancy (LLD) is often diagnosed in young patients who undergo repeated x-ray examinations quantifying the length discrepancy and monitoring progression. In our department LLD images are currently acquired using a low dose bi-plane system named EOS. Prior to the acquisition of diagnostic images a scout image is acquired at extremely low dose for planning purposes, i.e. approximately 1% of the dose required for diagnostic images. Dose reduction is important because children and adolescents are more sensitive to radiation than adults and they may undergo several LLD examinations. The purpose of the study was to investigate the accuracy and reliability of LLD measurements performed on scout images compared to diagnostic images. Materials and Methods: A retrospective pilot study including 30 consecutive patients (age 6-15 years) was performed. Two senior musculoskeletal radiologists measured the length of the femur, tibia and the total leg length on both legs on scout and diagnostic images. The measurements on scout and diagnostic images were performed in two separate sessions and the radiologists were blinded to the identity of the patients. Results: No significant differences between scouts and diagnostic images were found. The mean femoral length difference for the observers was 0.11 cm (p=0.09) and 0.07 cm (p=0.24) respectively, mean tibial length difference was 0.02 cm (p=0.77) and 0.01 cm (p=0.84). The mean total leg length difference was 0.01 cm (p= 0.92) and 0.03 cm (p=0.73). ICC was >0.99 indicating excellent inter rater reliability. Conclusion: The results suggest that there is no significant difference in LLD measurements performed on scouts and diagnostic images. Thus, scout based LLD measurements can be accurately and reliably performed in EOS.

AB - Objectives Leg Length Discrepancy (LLD) is often diagnosed in young patients who undergo repeated x-ray examinations quantifying the length discrepancy and monitoring progression. In our department LLD images are currently acquired using a low dose bi-plane system named EOS. Prior to the acquisition of diagnostic images a scout image is acquired at extremely low dose for planning purposes, i.e. approximately 1% of the dose required for diagnostic images. Dose reduction is important because children and adolescents are more sensitive to radiation than adults and they may undergo several LLD examinations. The purpose of the study was to investigate the accuracy and reliability of LLD measurements performed on scout images compared to diagnostic images. Materials and Methods: A retrospective pilot study including 30 consecutive patients (age 6-15 years) was performed. Two senior musculoskeletal radiologists measured the length of the femur, tibia and the total leg length on both legs on scout and diagnostic images. The measurements on scout and diagnostic images were performed in two separate sessions and the radiologists were blinded to the identity of the patients. Results: No significant differences between scouts and diagnostic images were found. The mean femoral length difference for the observers was 0.11 cm (p=0.09) and 0.07 cm (p=0.24) respectively, mean tibial length difference was 0.02 cm (p=0.77) and 0.01 cm (p=0.84). The mean total leg length difference was 0.01 cm (p= 0.92) and 0.03 cm (p=0.73). ICC was >0.99 indicating excellent inter rater reliability. Conclusion: The results suggest that there is no significant difference in LLD measurements performed on scouts and diagnostic images. Thus, scout based LLD measurements can be accurately and reliably performed in EOS.

KW - EOS imaging

KW - leg length discrepancy

KW - Pediatrics

KW - Radiology

KW - Orthopedics

M3 - Conference abstract for conference

ER -

Jensen J, Mussmann B, Pedersen NW, Al-Aubaidi Z, Torfing T. Micro dose acquisition in Leg length Discrepancy using the EOS imaging system. 2014. Abstract fra Dansk Ortopædkirurgisk Selskabs Kongres 2014, København, Danmark.